/// @description init
if !ready exit;
if palette == 0 exit;

#region dropper
	selector.interactable = interactable;
	if(selector.dropper_active) {
		selector.drawDropper(self);
		exit;
	}
#endregion

#region base UI
	var presets_x  = dialog_x;
	var presets_w  = ui(240);
	
	var content_x = dialog_x + presets_w + ui(16);
	var content_w = dialog_w - presets_w - ui(16);
	
	var p  = DIALOG_PAD;
	var p2 = DIALOG_PAD * 2;
	
	draw_sprite_stretched(THEME.dialog, 0, presets_x - p, dialog_y - p, presets_w + p2, dialog_h + p2);
	if(sFOCUS) draw_sprite_stretched_ext(THEME.dialog, 1, presets_x - p, dialog_y - p, presets_w + p2, dialog_h + p2, COLORS._main_accent, 1);
	
	draw_sprite_stretched(THEME.dialog, 0, content_x - p, dialog_y - p, content_w + p2, dialog_h + p2);
	if(sFOCUS) draw_sprite_stretched_ext(THEME.dialog, 1, content_x - p, dialog_y - p, content_w + p2, dialog_h + p2, COLORS._main_accent, 1);
	
	draw_set_text(f_p0, fa_left, fa_top, COLORS._main_text);
	draw_text(presets_x + ui(24), dialog_y + ui(16), __txt("Presets"));
	draw_text(content_x + (!interactable * ui(32)) + ui(24), dialog_y + ui(16), name);
	if(!interactable)
		draw_sprite_ui(THEME.lock, 0, content_x + ui(24 + 12), dialog_y + ui(16 + 12),,,, COLORS._main_icon);
#endregion

#region presets
	draw_sprite_stretched(THEME.ui_panel_bg, 1, presets_x + pal_padding, dialog_y + ui(48), ui(240) - pal_padding * 2, dialog_h - ui(48) - pal_padding);
	
	sp_presets.setFocusHover(sFOCUS, sHOVER);
	sp_presets.draw(presets_x + pal_padding + ui(4), dialog_y + ui(48) + ui(4));
	
	var bx = presets_x + presets_w - ui(44);
	var by = dialog_y + ui(12);
	var bs = ui(28);
	
	if(buttonInstant(THEME.button_hide, bx, by, bs, bs, mouse_ui, sHOVER, sFOCUS, __txtx("add_preset", "Add to preset"), THEME.add_20) == 2) {
		var dia = dialogCall(o_dialog_file_name, mouse_mx + ui(8), mouse_my + ui(8));
		dia.onModify = function (txt) {
			var file = file_text_open_write(txt + ".hex");
			for(var i = 0; i < array_length(palette); i++) {
				var cc = palette[i];
				var r  = number_to_hex(color_get_red(cc));
				var g  = number_to_hex(color_get_green(cc));
				var b  = number_to_hex(color_get_blue(cc));
				var a  = number_to_hex(color_get_alpha(cc));
				
				file_text_write_string(file, $"{r}{g}{b}{a}\n");
			}
			file_text_close(file);
			__initPalette();
		};
		dia.path = DIRECTORY + "Palettes/"
	}
	bx -= ui(32);
	
	if(buttonInstant(THEME.button_hide, bx, by, bs, bs, mouse_ui, sHOVER, sFOCUS, __txt("Refresh"), THEME.refresh_20) == 2)
		__initPalette();
	bx -= ui(32);
	
	if(buttonInstant(THEME.button_hide, bx, by, bs, bs, mouse_ui, sHOVER, sFOCUS, __txtx("color_selector_open_palette", "Open palette folder"), THEME.path_open_20) == 2) {
		var _realpath = DIRECTORY + "Palettes";
		shellOpenExplorer(_realpath)
	}
	draw_sprite_ui_uniform(THEME.path_open_20, 1, bx + bs / 2, by + bs / 2, 1, c_white);
	bx -= ui(32);
#endregion

#region palette

	#region tools
		var bx = content_x + content_w - ui(50);
		var by = dialog_y + ui(16);
		var bc = index_selecting[1] < 2? COLORS._main_icon : merge_color(COLORS._main_icon, COLORS._main_accent, 0.5);
		
		var _txt = index_selecting[1] < 2? __txtx("palette_editor_sort", "Sort palette") : __txtx("palette_editor_sort_selected", "Sort selected");
		var b = buttonInstant(THEME.button_hide, bx, by, ui(28), ui(28), mouse_ui, sHOVER, interactable && sFOCUS, _txt, THEME.sort, 0, bc);
		if(b) mouse_draggable = false;
		if(b == 2) {
			menuCall("palette_window_sort_menu", [ 
				menuItem(__txtx("palette_editor_sort_brighter", "Brighter"), function() { sortPalette(__sortBright); }), 
				menuItem(__txtx("palette_editor_sort_darker", "Darker"),     function() { sortPalette(__sortDark); }),
				-1,
				menuItem(__txtx("palette_editor_sort_hue", "Hue"),           function() { sortPalette(__sortHue); }), 
				menuItem(__txtx("palette_editor_sort_sat", "Saturation"),    function() { sortPalette(__sortSat); }), 
				menuItem(__txtx("palette_editor_sort_val", "Value"),         function() { sortPalette(__sortVal); }), 
			], bx + ui(32), by, fa_left, palette);
		}
		bx -= ui(32);
		
		var _txt = index_selecting[1] < 2? __txtx("palette_editor_reverse", "Reverse palette") : __txtx("palette_editor_reverse_selected", "Reverse selected");
		var b = buttonInstant(THEME.button_hide, bx, by, ui(28), ui(28), mouse_ui, sHOVER, interactable && sFOCUS, _txt, THEME.reverse, 0, bc);
		if(b) mouse_draggable = false;
		if(b == 2) {
			
			if(index_selecting[1] < 2)
				palette = array_reverse(palette);
			else {
				var _arr = array_create(index_selecting[1]);
				for(var i = 0; i < index_selecting[1]; i++)
					_arr[i] = palette[index_selecting[0] + i];
				_arr = array_reverse(_arr);
				
				for(var i = 0; i < index_selecting[1]; i++)
					palette[index_selecting[0] + i] = _arr[i];
			}
			
			onApply(palette);
		}
		bx -= ui(32);
	#endregion
	
	var pl_x = content_x + ui(60);
	var pl_y = dialog_y + ui(54);
	var pl_w = content_w - ui(154);
	var hh   = ui(24);
	
	var pd   = ui(0);
	var _len = array_length(palette);
	
	var min_col = 8;
	var col  = min(_len, min_col);
	var row  = ceil(_len / col);
	if(row > 8) {
		col = 16;
		row = ceil(_len / col);
	}
	
	var ww   = pl_w / col;
	var pl_h = hh * row;
	
	dialog_h = ui(408) + pl_h;
	
	var pdd = ui(6);
	var pl_sx = pl_x - pdd;
	var pl_sy = pl_y - pdd;
	var pl_sw = pl_w + pdd * 2;
	var pl_sh = pl_h + pdd * 2;
	
	draw_sprite_stretched(THEME.textbox, 3, pl_sx, pl_sy, pl_sw, pl_sh);
	draw_sprite_stretched(THEME.textbox, 0, pl_sx, pl_sy, pl_sw, pl_sh);
	
	selection_surface = surface_verify(selection_surface, pl_sw, pl_sh);
	
	var hover = -1, hvx, hvy;
	
	var _pw = ceil(ww - pd * 2);
	var _ph = ceil(hh - pd * 2);
	
	var _spx = pl_x - pdd;
	var _spy = pl_y - pdd;
	var ppos = palette_positions;
	
	var _hedge  = false;
	var _clrRep = {};
	var _palInd = [];
	
	for(var i = 0; i < row; i++)
	for(var j = 0; j < col; j++) {
		var index = i * col + j;
		if(index >= _len) break;
		
		var _p  = palette[index];
		var _pa = _color_get_alpha(_p);
		var _kx = pl_x + j * ww;
		var _ky = pl_y + i * hh;
		
		var _px = floor(_kx + pd);
		var _py = floor(_ky + pd);
		
		var _k  = string(_p);
		var _ii = 0;
		var _selecting = index >= index_selecting[0] && index < index_selecting[0] + index_selecting[1];
		
		while(struct_has(_clrRep, _k)) {
			_k = $"{_p}{_ii}";
			_ii++;
		}
		
		_clrRep[$ _k] = 1;
		
		if(struct_has(ppos, _k)) {
			ppos[$ _k][0] = (ppos[$ _k][0] == 0 || !_selecting)? _px - dialog_x : lerp_float(ppos[$ _k][0], _px - dialog_x, 4);
			ppos[$ _k][1] = (ppos[$ _k][1] == 0 || !_selecting)? _py - dialog_y : lerp_float(ppos[$ _k][1], _py - dialog_y, 4);
		} else {
			ppos[$ _k] = [ _px - dialog_x, _py - dialog_y ];
		}
		
		var _pdx = dialog_x + ppos[$ _k][0];
		var _pdy = dialog_y + ppos[$ _k][1];
		
		var _ind = 0;
		if(row == 1) {
				 if(j == 0)       _ind = 2;
			else if(j == col - 1) _ind = 3;
		} else {
				 if(index == 0)     	    _ind = 6;
			else if(i == 0 && j == col - 1) _ind = 7;
			else if(i == row - 2) {
			     if(j == col - 1 && _len - 1 < index + col)   _ind = 9;
			} else if(i == row - 1) {
				 if(j == 0)            _ind = 8;
				 if(j == col - 1)      _ind = 7;
				 if(index == _len - 1) _ind = 9;
			}
		}
		
		_palInd[index] = _ind;
		drawColor(_p, _pdx, _pdy, _pw, _ph, true, _ind);
		
		if(sHOVER && point_in_rectangle(mouse_mx, mouse_my, _kx, _ky, _kx + ww, _ky + hh)) {
			hover = index;
			hvx = _kx;
			hvy = _ky;
			
			if(_selecting && !point_in_rectangle(mouse_mx, mouse_my, _kx + 4, _ky + 4, _kx + ww - 8, _ky + hh - 8))
				_hedge = true;
		}
	}
	
	surface_set_target(selection_surface);
		DRAW_CLEAR
		for(var i = 0; i < row; i++)
		for(var j = 0; j < col; j++) {
			var index = i * col + j;
			if(index >= _len) break;
			
			if(index >= index_selecting[0] && index < index_selecting[0] + index_selecting[1]) {
				var _p  = palette[index];
				var _px = dialog_x + ppos[$ _p][0] - pl_sx;
				var _py = dialog_y + ppos[$ _p][1] - pl_sy;
				
				drawColor(_p, _px, _py, _pw, _ph, true, _palInd[index]);
			}
		}
	surface_reset_target();
	
	shader_set(sh_dialog_palette_selector);
		shader_set_f("dimension",     pl_sw, pl_sh);
		shader_set_i("edge",          (_hedge && !mouse_click(mb_left)) || index_dragging != noone);
		shader_set_color("edgeColor", COLORS._main_accent);
		
		draw_surface(selection_surface, pl_sx, pl_sy);
	shader_reset();
	
	if(index_dragging != noone) {
		if(hover > -1 && hover != index_dragging) {
			
			var prea = [];
			var cont = [];
			var posa = [];
			
			var _0 = index_selecting[0];
			var _1 = index_selecting[0] + index_selecting[1];
			var _2 = array_length(palette);
			
			for(var i = 0; i < _2; i++) {
					 if(i < _0) array_push(prea, palette[i]);
				else if(i < _1) array_push(cont, palette[i]);
				else            array_push(posa, palette[i]);
			}
			
			var _shf = clamp(hover - index_dragging, -index_selecting[0], _2 - (index_selecting[0] + index_selecting[1]));
			var _pal = [];
			
			if(_shf < 0) {
				for (var i = 0, n = array_length(prea) + _shf; i < n; i++)              		array_push(_pal, prea[i]);
				for (var i = 0, n = array_length(cont); i < n; i++)                     		array_push(_pal, cont[i]);
				for (var i = array_length(prea) + _shf, n = array_length(prea); i < n; i++)		array_push(_pal, prea[i]);
				for (var i = 0, n = array_length(posa); i < n; i++)                     		array_push(_pal, posa[i]);
				
				palette = _pal;
				
			} else if(_shf > 0) {
				for (var i = 0, n = array_length(prea); i < n; i++)                     		array_push(_pal, prea[i]);
				for (var i = 0, n = _shf; i < n; i++)                                   		array_push(_pal, posa[i]);
				for (var i = 0, n = array_length(cont); i < n; i++)                     		array_push(_pal, cont[i]);
				for (var i = _shf, n = array_length(posa); i < n; i++)                  		array_push(_pal, posa[i]);
				
				palette = _pal;
				
			}
			
			index_selecting[0] += _shf;
			index_dragging      = hover;
			onApply(palette);
		}
		
		if(mouse_release(mb_left)) {
			index_selecting = [ 0, 0 ];
			index_dragging  = noone;
		}
			
	} else {
		index_drag_x = 0;
		index_drag_y = 0;
		index_drag_w = 0;
		index_drag_h = 0;
	
		if(hover > -1) {
			
			if(mouse_press(mb_left, sFOCUS)) {
				
				if(interactable) {
					if(_hedge) index_dragging = hover;
					else {
						index_selecting = [ hover, 1 ];
						selector.setColor(palette[hover]);
					}
					
				} else if(!interactable) {
					index_selecting = [ hover, 1 ];
					selector.setColor(palette[hover]);
				}
				
				mouse_interact  = true;
				index_sel_start = hover;
				
			} else if(mouse_click(mb_left, sFOCUS) && mouse_interact) {
				
				if(hover > index_sel_start) {
					index_selecting[0] = index_sel_start;
					index_selecting[1] = hover - index_sel_start + 1;
					
				} else if(hover < index_sel_start) {
					index_selecting[0] = hover;
					index_selecting[1] = index_sel_start - hover + 1;
					
				} else {
					index_selecting[0] = hover;
					index_selecting[1] = 1;
				}
			}
			
		}
	}
	
	if(mouse_release(mb_left)) mouse_interact = false;
	
	selector.current_colors = noone;
	if(index_selecting[1] > 1) {
		colors_selecting = array_verify(colors_selecting, index_selecting[1]);
		for(var i = 0; i < index_selecting[1]; i++)
			colors_selecting[i] = palette[index_selecting[0] + i];
		selector.current_colors = colors_selecting;
	}
	
	var bx = content_x + content_w - ui(50);
	var by = pl_y - ui(2);
	
	if(array_length(palette) > 1) {
		if(buttonInstant(THEME.button_hide, bx, by, ui(28), ui(28), mouse_ui, sHOVER, interactable && sFOCUS, "", THEME.minus) == 2) {
			array_delete(palette, index_selecting[0], index_selecting[1]);
			if(array_empty(palette))
				palette = [ c_black ];
			index_selecting = [ 0, 0 ];
			
			onApply(palette);
		}
	} else {
		draw_sprite_ui_uniform(THEME.minus, 0, bx + ui(14), by + ui(14), 1, COLORS._main_icon, 0.5);
	}
	
	bx -= ui(32);
	if(buttonInstant(THEME.button_hide, bx, by, ui(28), ui(28), mouse_ui, sHOVER, interactable && sFOCUS, "", THEME.add) == 2) {
		palette[array_length(palette)] = c_black;
		index_selecting = [ array_length(palette), 1 ];
		
		onApply(palette);
	}
	
	bx = content_x + ui(18);
	if(buttonInstant(THEME.button_hide, bx, by, ui(28), ui(28), mouse_ui, sHOVER, interactable && sFOCUS, __txtx("palette_editor_load", "Load palette file") + " (.hex)", THEME.file) == 2) {
		var path = get_open_filename_pxc("HEX palette|*.hex", "");
		key_release();
		
		if(isPaletteFile(path)) {
			palette = loadPalette(path);
			onApply(palette);
		}
	}
	draw_sprite_ui_uniform(THEME.file, 0, bx + ui(14), by + ui(14), 1, COLORS._main_icon);
#endregion

#region selector
	var col_x = content_x + ui(20);
	var col_y = dialog_y  + ui(70) + pl_h;
	
	selector.draw(col_x, col_y, sFOCUS, sHOVER);
#endregion

#region controls
	var bx = content_x + content_w - ui(36);
	var by = dialog_y + dialog_h - ui(36);
	
	b_apply.register();
	b_apply.setFocusHover(sFOCUS, sHOVER);
	b_apply.draw(bx - ui(18), by - ui(18), ui(36), ui(36), mouse_ui, THEME.button_lime);
	
	bx -= ui(48);
	b_cancel.register();
	b_cancel.setFocusHover(sFOCUS, sHOVER);
	b_cancel.draw(bx - ui(18), by - ui(18), ui(36), ui(36), mouse_ui, THEME.button_hide);
#endregion